Battery cells, batteries and electrical devices

Abstract

This application provides a battery cell, a battery, and an electric device, and relates to the technical field of batteries. The battery cell includes a housing, an electrode unit, and an insulating member. The housing includes a first wall, and the electrode unit is accommodated in the housing. The insulating member covers the outside of the housing and covers the outer surface of the first wall that is away from the electrode unit in the thickness direction. The insulating member has a first cutout area located on the side of the first wall that is away from the electrode unit in the thickness direction of the first wall. The first wall has a first exposed area for connecting to a pressing bar at a position corresponding to the first cutout area. When battery cells with this structure are assembled into a set to form a battery, the pressing bar can be directly connected to the housing, reducing the risk of the housing and pressing bar, which are indirectly connected via the insulating member, becoming detached, and improving connection strength. This contributes to improving the assembly quality and usability of batteries including such battery cells.

Description

[Technical Field]

[0001] TECHNICAL FIELD This application relates to the field of batteries, and in particular to battery cells, batteries, and electrical devices. [Background technology]

[0002] In recent years, new energy vehicles have developed dramatically, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. With the popularity of new energy vehicles, demand for power battery products is also increasing. Batteries are composed of multiple stacked battery cells. However, conventional batteries have a problem in that the assembly is not reliable after assembling multiple battery cells into a set. Furthermore, the battery cells may be prone to shaking inside the battery during use, resulting in poor assembly quality and poor usage stability. Summary of the Invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electric device that can effectively improve the assembly quality and use stability of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell including: a housing including a first wall; an electrode unit accommodated in the housing; and an insulating member covering the outside of the housing and covering an outer surface of the first wall away from the electrode unit in a thickness direction of the first wall, the insulating member having a first cutout region located on a side of the first wall away from the electrode unit in the thickness direction of the first wall, the first wall forming a first exposed region for connection to a pressing bar at a position corresponding to the first cutout region.

[0005] In the above technical solution, an insulating member is coated on the outer surface of the housing to insulate the battery cell housing from the external environment, thereby reducing the risk of short-circuiting of the battery cells during use. Furthermore, a first cutout region is formed in the insulating member at a location corresponding to the first wall of the housing to form a first exposed region. This allows the battery cells to be connected to the pressing bar via the first exposed region, and the pressing bar can be directly connected to the housing when the battery cells are assembled into a set to form a battery. This eliminates the need for the housing to be indirectly connected to the pressing bar via the insulating member, thereby reducing the impact of the insulating member on the connection between the battery cells and the pressing bar, effectively improving connection strength and reducing the risk of the housing and pressing bar, which are indirectly connected via the insulating member, becoming detached. As a result, the battery cells are insulated from the external environment and the assembly quality when the battery cells are assembled into a set is improved, contributing to improved assembly quality and operational stability of batteries using such battery cells.

[0006] In some embodiments, the area of ​​the first exposed region is S, and S≧50 mm 2 Meet the following.

[0007] In the above technical solution, the area of ​​the first exposed area for connecting to the pressure bar of the first wall is 50 mm 2 By doing so, the first wall has a sufficient area for connection with the pressing bar, which contributes to increasing the connection area between the first wall and the pressing bar, thereby increasing the connection strength.

[0008] In some embodiments, the minimum distance between the first exposed area and the edge of the first wall is D1, and satisfies 1 mm≦D1≦5 mm.

[0009] In the above technical proposal, by setting the minimum distance between the first exposed area and the edge of the first wall to 1 mm to 5 mm, the minimum distance between the first cutout area provided in the insulating member and the edge of the first wall is 1 mm to 5 mm. This improves the difficulty of manufacturing the first cutout area, which is caused by a distance between the first cutout area and the edge of the first wall being too small, and reduces the difficulty of manufacturing the battery cell. Also, it improves the problem of the insulating member covering too much of the first wall, which is caused by a distance between the first cutout area and the edge of the first wall being too large, resulting in a first exposed area formed on the first wall being too small.

[0010] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, and a side wall surrounding the first wall and the second wall, the insulating member includes a first insulating member and a second insulating member that are provided separately, the first insulating member covering an outer surface of the first wall facing away from the electrode unit, and the second insulating member covering an outer surface of the second wall facing away from the electrode unit and an outer surface of the side wall facing away from the electrode unit.

[0011] In the above technical proposal, the insulating member is structured so that a first insulating member covering the first wall and a second insulating member covering the side wall and second wall are provided separately, so that the first insulating member and the second insulating member are provided corresponding to the first wall of the housing and the second wall and side wall of the housing, respectively, which contributes to reducing the difficulty of assembling the insulating member and the housing.

[0012] In some embodiments, the first cutout area is provided in the first insulating member.

[0013] In the above technical solution, the first cutout area is separately provided in the first insulating member, thereby forming the first exposed area on the first wall. This insulating member has a simple structure, is easy to process and manufacture, and the first cutout area and the second insulating member do not interfere with each other, which contributes to reducing the difficulty of assembling the battery cell.

[0014] In some embodiments, the second insulating member has a folded portion arranged circumferentially around the first wall and located on the side of the first wall facing away from the electrode unit, and the folded portion and the edge of the first insulating member together form the first cutout area.

[0015] In the above technical solution, the second insulating member has a bent portion provided at the edge of the first wall along the circumferential direction of the first wall. The edge of the first insulating member provided at the first wall and the bent portion together form a first cutout area, thereby forming a first exposed area in the first wall. A battery cell with this structure does not require the first insulating member to have a through-hole, improving the overall structural strength of the first insulating member and reducing the size and dimensions of the first cutout area.

[0016] In some embodiments, a portion of the bent portion is located between the first wall and the first insulating member in a thickness direction of the first wall.

[0017] In the above technical proposal, by arranging a portion of the bent portion of the second insulating member between the first wall and the first insulating member in the thickness direction of the first wall, the first insulating member can press a portion of the bent portion against the first wall, thereby improving the connection stability of the bent portion of the second insulating member provided on the first wall and reducing the risk of the bent portion falling off.

[0018] In some embodiments, the first insulating member and the folded portion together form two of the first cutout areas, and in a first direction perpendicular to the thickness direction of the first wall, the two first cutout areas are located at both ends of the first insulating member.

[0019] In the above technical solution, both ends of the first insulating member in the first direction and the bent portion together form two cutout areas, thereby forming two first exposed areas arranged along the first direction on the first wall, and the two first exposed areas are located at both ends of the first insulating member, respectively. This allows the first wall to connect to the pressing bar through the two first exposed areas, contributing to further improving the connection strength between the housing and the pressing bar. It also reduces the effect of interference with the first insulating member when the first exposed areas are connected to the pressing bar, contributing to reducing the difficulty of assembling the battery cell and the pressing bar.

[0020] In some embodiments, the folding portion includes a first segment, a second segment, a third segment, and a fourth segment connected in sequence circumferentially around the first wall, the first segment and the third segment facing each other in the first direction, the second segment and the fourth segment facing each other in the second direction, the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other, the first insulating member is located between the first segment and the third segment in the first direction, one of the first cutout areas is formed by the first segment, a portion of the second segment, a portion of the fourth segment, and one end of the first insulating member in the first direction, and another of the first cutout areas is formed by the third segment, a portion of the second segment, a portion of the fourth segment, and the other end of the first insulating member in the first direction.

[0021] In the above technical solution, the bending portion has a first segment, a second segment, a third segment, and a fourth segment connected in sequence in the circumferential direction of the first wall, and the first segment and the third segment are opposed to each other in the first direction, and the second segment and the fourth segment are opposed to each other in the second direction, thereby forming a bending portion with a rectangular ring structure. In addition, by providing a first insulating member between the first segment and the third segment in the first direction, both end edges of the first insulating member in the first direction can form two first cutout areas with the bending portion, respectively, which is simple in structure and easy to implement.

[0022] In some embodiments, the second wall and the side wall are integrally molded, and in the thickness direction of the first wall, one end of the side wall is connected to the second wall and the other end is formed as an opening, and the first wall is an end cover that closes the opening.

[0023] In the above technical solution, the second wall and the side wall of the housing are formed as an integrally molded structure, and an opening is formed at the end of the side wall away from the second wall, and when the first wall closes the opening, the housing can be assembled from two parts. This housing structure makes it easy to cover the second insulating member of the insulating member on the outer surface of the integrally molded second wall and side wall, contributing to reducing the difficulty of assembling the battery cell.

[0024] In some embodiments, the battery cell further includes an electrode terminal provided on the first wall and electrically connected to the electrode unit, and the insulating member is provided with a mounting hole through which the electrode terminal is drilled, and the mounting hole is provided at a distance from the first cutout area.

[0025] In the above technical solution, the electrode terminal is provided on the first wall, and a mounting hole through which the electrode terminal passes is provided at a position of the insulating member corresponding to the electrode terminal. By providing the mounting hole at a distance from the first cutout area, the first exposed area formed on the first wall corresponding to the first cutout area can be provided at a distance from the electrode terminal, thereby reducing the impact of interference with the electrode terminal when the first exposed area is connected to an external component. Furthermore, by using the insulating member to prevent communication between the first cutout area and the mounting hole, the insulating member is inserted onto the electrode terminal, improving the connection reliability of the insulating member.

[0026] In some embodiments, the minimum distance between the first cutout area and the mounting hole is D2, where D2≧0.5 mm.

[0027] In the above technical proposal, by setting the minimum distance between the first cutout area and the mounting hole to 0.5 mm or more, the minimum dimension of the portion of the insulating material between the first cutout area and the mounting hole is 0.5 mm or more, thereby reducing the risk of breakage due to the dimension of the portion of the insulating material between the first cutout area and the mounting hole being too small.

[0028] In some embodiments, the insulating member has two first cutout areas arranged along a first direction so as to form two first exposed areas arranged along the first direction perpendicular to the thickness direction of the first wall, and the first wall has two electrode terminals arranged along the first direction and positioned between the two first cutout areas, and the minimum distance between each of the first cutout areas and the adjacent mounting hole in the first direction is D2.

[0029] In the above technical solution, two first cutout areas are provided arranged along a first direction, two electrode terminals are provided on the first wall arranged along the first direction and located between the two first cutout areas, and the minimum distance between the first cutout area and the adjacent mounting hole is D2. By setting the minimum dimension of D2, it is possible to reduce the risk of the portions of the insulating member corresponding to the first exposed areas and the electrode terminals in the first direction being broken during use.

[0030] In some embodiments, the insulating member is provided with two first cutout areas arranged along a first direction so as to form two first exposed areas in the first wall arranged along the first direction perpendicular to the thickness direction of the first wall, and the electrode terminal is located between the two first exposed areas in the first direction.

[0031] In the above technical solution, two first cutout areas arranged along the first direction are provided in the insulating member to form two first exposed areas arranged along the first direction on the first wall. An electrode terminal is also provided between the two first exposed areas. The two first exposed areas can further improve the connection strength between the first wall and the pressing bar. Furthermore, providing the two first exposed areas on both sides of the electrode terminal can reduce the difficulty of connecting the battery cell to the pressing bar when assembling the battery cell into a set.

[0032] In some embodiments, the housing further includes a second wall facing the first wall in a thickness direction of the first wall, and the battery cell further includes two electrode terminals provided on the first wall and the second wall, respectively, and electrically connected to the electrode unit.

[0033] In the above technical solution, by respectively arranging the two electrode terminals of the battery cell on the opposing first and second walls of the housing, more space can be secured for forming the first exposed area on the first wall, and the difficulty of forming the first cutout area on the insulating member can be reduced.

[0034] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, and the insulating member further includes a second cutout area located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed area for connecting to the housing at a position corresponding to the second cutout area.

[0035] In the above technical solution, first and second cutout regions are provided at positions on both sides of the insulating member corresponding to the first and second walls, respectively. That is, the insulating member has first and second cutout regions on opposite sides of the housing in the thickness direction of the first wall. This allows first and second exposed regions to be formed on the first and second walls of the housing, respectively, and the first and second walls of the housing can be connected to the pressing bar and the housing, respectively, through the first and second exposed regions. This improves the structural stability of the battery cells assembled within the housing. Furthermore, because the housing is directly connected to the housing, the risk of the housing and the housing being easily detached, which is indirectly connected via the insulating member, is reduced.

[0036] In a second aspect, an embodiment of the present application further provides a battery, which includes the battery cell described above.

[0037] In some embodiments, the battery further includes a housing and a pressure bar, the pressure bar being housed in the housing together with the battery cells and being adhered to the first exposed area.

[0038] In the above technical solution, the battery is provided with a housing and a pressing bar, and the pressing bar is attached to the first exposed area of ​​the battery cell housing to secure the battery cell within the battery housing. In a battery with this structure, the battery cell housing can be directly attached to the pressing bar without an insulating member, which helps reduce the influence of the insulating member on the adhesion between the battery cell and the pressing bar, reduces the risk of the housing and pressing bar, which are indirectly attached via the insulating member, becoming detached, and effectively increases the adhesive strength. As a result, the structural stability of the battery cells assembled within the housing is improved, the risk of the battery cells shaking or coming off during use is reduced, and the assembly quality and usage stability of the battery can be improved.

[0039] In some embodiments, the battery includes a plurality of the battery cells, and the pressure bar is adhered to the first exposed areas of the plurality of the battery cells.

[0040] In the above technical solution, a plurality of battery cells are provided in the housing, and the pressing bar and the first exposed areas of the plurality of battery cells are adhered to each other, so that the pressing bar can connect the plurality of battery cells together, which contributes to improving the structural strength and structural stability of the plurality of battery cells in the housing, and effectively improves the stability of battery use.

[0041] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, and the insulating member further includes a second cutout area located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed area that is adhered to the housing at a position corresponding to the second cutout area.

[0042] In the above technical solution, the second exposed area of ​​the battery cell housing is bonded to the housing, thereby more securely fixing the battery cell within the housing. In a battery with this structure, the battery cell housing is directly bonded to the housing without an insulating member, which helps reduce the influence of the insulating member on the adhesion between the battery cell and the housing and effectively increases the adhesive strength. This improves the structural stability of the battery cell assembled within the housing, reduces the risk of the battery cell shaking or coming loose during use, and improves the assembly quality and usage stability of the battery.

[0043] In a third aspect, embodiments of the present application further provide an electrical device, the electrical device including the battery described above. [Brief explanation of the drawings]

[0044] In order to more clearly explain the technical solutions of the embodiments in this application, the drawings necessary for explaining the embodiments will be briefly described below. The drawings described only illustrate some embodiments of this application and do not limit the scope. Those skilled in the art can obtain other related drawings based on these drawings without using inventive abilities.

[0045] [Figure 1] 1 is a schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] 1 is a cross-sectional view of a battery according to some embodiments of the present application. [Figure 3] 1 is a schematic diagram of a battery cell according to some embodiments of the present application. [Figure 4] FIG. 1 is a plan view of a battery cell according to some embodiments of the present application. [Figure 5] 1 is a schematic diagram of a battery cell (after removing an insulating member) according to some embodiments of the present application. FIG. [Figure 6] 1 is a structural schematic diagram of a first insulating member of a battery cell according to some embodiments of the present application. [Figure 7] 10A to 10C are schematic diagrams illustrating the configuration of battery cells according to some other embodiments of the present application. [Figure 8] FIG. 10 is a plan view of a battery cell according to some other embodiments of the present application. [Figure 9] 10A and 10B are schematic diagrams illustrating the configuration of a battery cell (after removing the first insulating member) according to some other embodiments of the present application. [Figure 10] 5A to 5C are schematic diagrams illustrating the configuration of a first insulating member of a battery cell according to some other embodiments of the present application. [Figure 11] FIG. 2 is a bottom view of a battery cell according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0046] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly explained below with reference to the drawings used in the embodiments of the present application, and it goes without saying that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application without using inventive ability fall within the scope of protection of the present application.

[0047] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In this application, the terms used in the specification are merely for the purpose of describing specific embodiments and are not intended to limit the scope of this application. Furthermore, the terms "comprise," "have," and similar terms used in the specification, claims, and drawings of this application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," and the like used in the specification, claims, and drawings of this application are merely used to distinguish between similar objects and are not intended to limit a particular order or sequence.

[0048] References in this application to an "embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various parts of the specification are not all referring to the same embodiment, nor are they separate or alternative embodiments exclusive of one another.

[0049] In the description of this application, unless otherwise clearly defined or limited, terms such as "attached," "linked," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. They may also refer to a direct connection, an indirect connection via an intermediate, or two elements communicating with each other or interacting with each other. Those skilled in the art will be able to understand the specific meanings of the above terms in this application according to the specific circumstances.

[0050] The term "and / or" used in this application is merely for explaining the relation between related objects and indicates that three relations can exist, for example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0051] In the embodiments of the present application, like reference numerals indicate like parts, and for the sake of simplicity, detailed descriptions of the same parts between different embodiments will be omitted. Furthermore, it is understood that the dimensions such as thickness, length, and width of each part of the embodiments of the present application and the overall dimensions such as thickness, length, and width of the integrated device shown in the drawings are merely illustrative and do not limit the present application.

[0052] In this application, "plurality" means two or more (including two).

[0053] In the embodiment of the present application, the battery cell may be a secondary battery, which means that the battery cell can be continuously used after being discharged by activating the active material through charging.

[0054] In the embodiments of the present application, the battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, lead acid batteries, and the like.

[0055] A battery cell generally includes an electrode unit, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short-circuiting between the positive and negative electrodes and allows the active ions to pass through.

[0056] In some embodiments, the positive electrode is a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0057] For example, the positive electrode current collector has two surfaces facing each other in the thickness direction, and the positive electrode active material is provided on one or both of the two facing surfaces of the positive electrode current collector.

[0058] For example, the positive electrode current collector can be a metal foil sheet or a composite current collector. For example, the metal foil sheet can be made of silver-surface-treated aluminum, stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, or titanium. The composite current collector can include a polymeric substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0059] For example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. However, the positive electrode active material is not limited to these materials, and other conventional materials usable as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Here, examples of lithium-containing phosphates include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (which can be abbreviated as LFP)), a lithium iron phosphate and carbon composite, lithium manganese phosphate (e.g., LiMnPO4), a lithium manganese phosphate and carbon composite, lithium manganese iron phosphate, and a lithium manganese iron phosphate and carbon composite.

[0060] In some examples, the negative electrode is a negative electrode sheet, which may include a negative electrode current collector.

[0061] For example, the negative electrode current collector can be a metal foil sheet, a metal foam, or a composite current collector. For example, the metal foil sheet can be made of silver-surface-treated aluminum, stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0062] For example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0063] For example, the negative electrode current collector has two surfaces opposing each other in the thickness direction, and the negative electrode active material is provided on one or both of the two opposing surfaces of the negative electrode current collector.

[0064] For example, the negative electrode active material may be any negative electrode active material for battery cells known in the art, and may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate.

[0065] In some embodiments, the material of the positive electrode current collector can be aluminum and the material of the negative electrode current collector can be copper.

[0066] In some embodiments, the electrode unit further includes a separator, the separator being disposed between the positive electrode and the negative electrode.

[0067] In some embodiments, the separator is a separator membrane. In the present application, the type of separator membrane is not particularly limited, and any separator membrane having a known porous structure with excellent chemical stability and mechanical stability can be used.

[0068] For example, the main material of the separator membrane is at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0069] In some embodiments, the separator is a solid electrolyte that is disposed between the positive and negative electrodes and serves both to conduct ions and to separate the positive and negative electrodes.

[0070] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive electrode and the negative electrode. In this application, the type of electrolyte is not particularly limited and can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0071] In some embodiments, the electrode unit has a wound structure, where a positive electrode sheet and a negative electrode sheet are wound together to form the wound structure.

[0072] In some embodiments, the electrode unit is a laminate structure.

[0073] In some embodiments, the shape of the electrode unit may be cylindrical, flat, polygonal, or the like.

[0074] In some embodiments, the electrode unit includes tabs through which current flows out of the electrode unit, the tabs including a positive electrode tab and a negative electrode tab.

[0075] In some embodiments, the battery cell may include a housing. The housing is used to enclose components such as the electrode unit and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), an aluminum coating, or the like.

[0076] For example, the battery cells may be cylindrical battery cells, prismatic battery cells, battery pack cells, or other shaped battery cells. Prismatic battery cells include rectangular case battery cells, blade-shaped battery cells, and polygonal prism batteries. Polygonal prism batteries include, for example, hexagonal prism batteries, and are not particularly limited in this application.

[0077] A battery according to the embodiments of the present application is a single physical module that contains one or more battery cells to provide higher voltage and capacity.

[0078] In some embodiments, the battery may be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged to form a battery module.

[0079] In some embodiments, the battery may be a battery pack, which includes a housing and battery cells, with the battery cells or battery modules housed in the housing.

[0080] In some embodiments, the housing can be part of a chassis structure of a vehicle, for example, part of the housing can be at least a portion of the floor of the vehicle or at least a portion of a cross member and side rail of the vehicle.

[0081] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, or the like.

[0082] Batteries have the excellent advantages of high energy density, low environmental pollution, high power density, long service life, wide range of applications, and low self-discharge coefficient, and are an important component of the current development of new energy.

[0083] For a typical battery cell, the battery cell housing typically includes a housing body and an end cover, with the end cover closing the opening of the housing body. To facilitate assembly of the battery cell, electrode terminals are typically attached to the end cover of the battery cell. Therefore, when the end cover closes the housing body, the electrode terminals, current collectors, and tabs are first stacked and welded together, thereby achieving electrical connection between the electrode terminals and the electrode units. In this case, the electrode terminals serve as output poles of the battery cell, enabling input and output of electrical energy to and from the battery cell. Finally, the end cover is connected to the housing body.

[0084] Through research by the inventors, we have found that batteries typically contain multiple battery cells, which are arranged in sets and housed in a battery casing. To reduce the risk of short-circuiting between the battery cells, a blue film is typically applied to the exterior of the housing body, and top cover adhesive strips are attached to the housing end covers to ensure insulation and isolation between the battery cells. To reduce the risk of the battery cells shaking within the casing when assembling the battery cells into a set, the battery cell housing body and the casing must be bonded together, a pressure bar must be attached to the battery casing, and a structural adhesive must be applied to the housing end covers of each battery cell. By bonding the pressure bar to the end covers of the battery cells, the battery cells are assembled together, thereby improving the overall structural strength after the battery cells are assembled into a set and enhancing the stability and reliability of the battery. However, when stacking battery cells with this structure into a set, the structural adhesive is restricted by the top cover adhesive strip, preventing direct bonding between the pressure bar and the end covers. Therefore, a top cover adhesive piece is provided between the pressure bar and the end cover, and the pressure bar and the end cover are indirectly attached via the top cover adhesive piece. The connection strength between the top cover adhesive piece and the end cover is insufficient to bond the pressure bar to the battery cell, which can result in insecure adhesion between the battery cell and the pressure bar when assembling multiple battery cells into a set. Furthermore, during use, the tension of the pressure bar can cause the top cover adhesive piece to come off the end cover, resulting in separation of the pressure bar and the battery cell, which can degrade the assembly quality and operational stability of the battery.

[0085] Based on the above research, the inventors conducted extensive research to solve the problems of poor battery assembly quality and usage stability, and as a result, designed a battery cell. The battery cell includes a housing, an electrode unit, and an insulating member. The housing includes a first wall. The electrode unit is accommodated in the housing. The insulating member covers the outside of the housing and covers the outer surface of the first wall that is away from the electrode unit in the thickness direction of the first wall. A first cutout region is provided in the insulating member, and the first cutout region is located on the side of the first wall that is away from the electrode unit in the thickness direction of the first wall. The first wall forms a first exposed region for connection to a pressing bar at a position corresponding to the first cutout region.

[0086] In a battery cell with this structure, an insulating member is coated on the outer surface of the housing to insulate and isolate the battery cell housing from the external environment, thereby reducing the risk of short-circuiting the battery cell during use. Furthermore, by forming a first cutout area in the insulating member at a location corresponding to the first wall so as to form a first exposed area in the first wall of the housing, the battery cell can be connected to the pressing bar via the first exposed area. When the battery cells are assembled into a set to form a battery, the pressing bar can be directly connected to the housing. Therefore, the housing is not indirectly connected to the pressing bar via the insulating member, which contributes to reducing the influence of the insulating member on the connection between the battery cell and the pressing bar, effectively improving the connection strength and reducing the risk of the housing and pressing bar, which are indirectly connected via the insulating member, becoming detached. As a result, the battery cell is insulated from the external environment and the assembly quality when the battery cells are assembled into a set is improved, contributing to improving the assembly quality and usage stability of batteries using such battery cells.

[0087] The battery cells disclosed in the embodiments of the present application can be used in electrical devices such as, but not limited to, vehicles, ships, and aircraft. Using the battery cells and batteries disclosed in the present application to configure a power supply system for an electrical device can help solve the problem of inaccurate battery cell assembly that occurs when assembling multiple battery cells into a set, and can improve the assembly quality and usage stability of the battery.

[0088] An embodiment of the present application provides a battery-powered electric device. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric scooter, an electric car, a boat, an aircraft, etc. Here, the electric toy includes stationary or mobile devices, such as a game console, an electric car toy, an electric boat toy, and an electric airplane toy. The aircraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0089] In the following embodiment, for convenience of explanation, a case will be described in which an electric device according to an embodiment of the present application is a vehicle 1000 as an example.

[0090] FIG. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be an electric vehicle, a hybrid vehicle, or a range-extended electric vehicle. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 is for supplying power to the vehicle 1000, and may be, for example, an operating power source or a power source for use by the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is for controlling the battery 100 to supply power to the motor 300, and may, for example, control the battery 1000 to supply power required for starting, navigating, and driving the vehicle 1000.

[0091] In some embodiments of the present application, the battery 100 can be used not only as an operating power source or power source for the vehicle 1000, but also as a power source for the vehicle 1000 to provide power for the vehicle 1000 in place of gasoline, natural gas, or a portion thereof.

[0092] Fig. 2 is a cross-sectional view of a battery 100 according to some embodiments of the present application. Fig. 3 is a schematic diagram of a battery cell 20 according to some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20 housed in the housing 10.

[0093] The housing 10 provides an assembly space for the battery cells 20 and may be composed of multiple structures. In some embodiments, the housing 10 may include a first housing main body 11 and a second housing main body 12. The first housing main body 11 and the second housing main body 12 together define an assembly space for accommodating the battery cells 20. The second housing main body 12 has a hollow structure with one end open, and the first housing main body 11 may have a plate-like structure. The first housing main body 11 closes the open side of the second housing main body 12, thereby defining the assembly space together with the second housing main body 12. Both the first housing main body 11 and the second housing main body 12 may have a hollow structure with one end open. The open side of the first housing main body 11 can close the open side of the second housing main body 12. Of course, the housing 10 formed by the first housing main body 11 and the second housing main body 12 may have various shapes, such as a cylindrical body or a rectangular parallelepiped. For example, in FIG. 2, the housing 10 has a rectangular parallelepiped shape.

[0094] The battery 100 may include one or more battery cells 20 within the housing 10. When multiple battery cells 20 are included within the housing 10, the multiple battery cells 20 may be connected in series, parallel, or series-parallel. A series-parallel connection refers to connecting multiple battery cells 20 in series and parallel. The multiple battery cells 20 may be directly connected in series, parallel, or series-parallel, and the entire configuration of the multiple battery cells 20 may be housed within the housing 10. Of course, the battery 100 may also include multiple battery cells 20 first connected in series, parallel, or series-parallel to form a battery module, and then the multiple battery modules may be connected in series, parallel, or series-parallel and housed within the housing 10 as a whole. The battery 100 may further include other structures, such as bus bars. The bus bars connect the multiple battery cells 20, thereby achieving electrical connection between the multiple battery cells 20.

[0095] Each battery cell 20 may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited to these. The battery cells 20 may have a cylindrical, flat, rectangular, or other shape. For example, in FIG. 3, the battery cells 20 have a rectangular parallelepiped structure.

[0096] In some embodiments, as shown in Fig. 2, the battery 100 may further include a pressure bar 30. The battery 100 includes a plurality of battery cells 20, and the pressure bar 30 is provided inside the housing 10. The pressure bar 30 is connected to the plurality of battery cells 20 and fixes the plurality of battery cells 20 as a unit. This helps reduce the risk of the plurality of battery cells 20 shaking or bumping into each other inside the housing 10.

[0097] 2, for example, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom of the housing 10. That is, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom surface of the second housing main body 12 facing the first housing main body 11, and the other end is bonded to the pressing bar 30. The pressing bar 30 is bonded to the multiple battery cells 20, and forms the multiple battery cells 20 housed in the housing 10 into a single unit. This improves the overall structural strength of the battery 100 and reduces the risk of the battery cells 20 shaking or hitting each other during use.

[0098] Furthermore, the battery cells 20 may be placed upright in the housing 10, or may be placed upside down in the housing 10. When the battery cells 20 are placed upright in the housing 10, the bottoms of the battery cells 20 are typically bonded to the bottom of the housing 10, and the pressure bar 30 is bonded to the tops of the battery cells 20. When the battery cells 20 are placed upside down in the housing 10, the tops of the battery cells 20 are typically bonded to the top of the housing 10, and the pressure bar 30 is bonded to the bottoms of the battery cells 20. For example, in FIG. 2 , the battery cells 20 are placed upright in the housing 10.

[0099] According to some embodiments of the present application, as shown in FIGS. 2 , 3 , 4 , and 5 , FIG. 4 is a plan view of a battery cell 20 according to some embodiments of the present application, and FIG. 5 is a schematic diagram of the battery cell 20 (after removing an insulating member 23) according to some embodiments of the present application. The present application provides the battery cell 20, which includes a housing 21, an electrode unit 22, and an insulating member 23. The housing 21 includes a first wall 211. The electrode unit 22 is accommodated in the housing 21. The insulating member 23 covers the outside of the housing 21 and covers an outer surface of the first wall 211 that is away from the electrode unit 22 in the thickness direction X of the first wall. A first cutout region 231 is provided in the insulating member 23, and the first cutout region 231 is located on a side of the first wall 211 that is away from the electrode unit 22 in the thickness direction X of the first wall. The first wall 211 forms a first exposed area 2111 for connection to the pressure bar 30 at a position corresponding to the first cutout area 231 .

[0100] The housing 21 may contain an electrolyte, such as an electrolytic solution. The housing 21 may have various structural forms, such as a cylindrical body or a rectangular parallelepiped. Similarly, the housing 21 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloys, etc.

[0101] In some embodiments, the housing 21 may further include a second wall 212 and a side wall 213. The second wall 212 faces the first wall 211 in the thickness direction X of the first wall, and the side wall 213 surrounds the second wall 212 and is integrally formed with the second wall 212. As a result, the side wall 213 has one end connected to the second wall 212 and the other end forming an opening 2131 facing the second wall 212. That is, the side wall 213, together with the second wall 212, forms a housing main body having an accommodation chamber. The accommodation chamber accommodates the electrode unit 22 and has the opening 2131. That is, the side wall 213 and the second wall 212 form a hollow structure having the opening 2131 at one end, and the first wall 211 closes the opening 2131 formed by the side wall 213. That is, the first wall 211 is an end cover for closing the opening 2131 of the housing 21. The first wall 211 closes and seals the opening 2131 of the side wall 213 so as to form an enclosed space for accommodating the electrode unit 22 and the electrolyte. That is, the first exposed region 2111 is formed in the end cover of the housing 21.

[0102] In other embodiments, the side wall 213 is integrally formed with the first wall 211, and the second wall 212 serves as an end cover that closes the opening 2131. That is, the first exposed area 2111 is formed on the bottom wall of the housing body of the housing 21 that faces the end cover. Of course, the housing 21 is not limited to the above structure and may have other structures. For example, the housing 21 may include a first wall 211, a second wall 212, and a side wall 213 that are provided separately. The side wall 213 forms a hollow structure having openings 2131 at opposite ends, and the first wall 211 and the second wall 212 close and seal the two openings 2131 in the side wall 213, respectively. This forms an enclosed space for containing the electrode unit 22 and the electrolyte.

[0103] The battery cell 20 can be assembled by first placing the electrode unit 22 into the housing body formed by the side wall 213 and the second wall 212, filling the housing body with electrolyte, and then closing the opening 2131 of the housing body with the first wall 211.

[0104] The housing 21 may have various shapes, such as a cylindrical body, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 21 can be determined according to the specific shape of the electrode unit 22. For example, if the electrode unit 22 has a cylindrical structure, a housing 21 with a cylindrical structure can be used, and if the electrode unit 22 has a rectangular parallelepiped structure, a housing 21 with a rectangular parallelepiped structure can be used. For example, in FIG. 3, the housing 21 has a rectangular parallelepiped structure.

[0105] The electrode unit 22 is a component that causes an electrochemical reaction within the battery cell 20. The electrode unit 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode unit 22 may have a variety of structures. For example, the electrode unit 22 may have a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or a laminated structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet. Similarly, the housing 21 may contain one or more electrode units 22. For example, in FIG. 2, there are two electrode units 22, and the two electrode units 22 are stacked in the thickness direction.

[0106] The insulating member 23 covers the outside of the housing 21, and also covers the outer surface of the first wall 211 that is away from the electrode unit 22 in the thickness direction X of the first wall. That is, the insulating member 23 covers the entire outer surface of the housing 21 such that the first wall 211 of the housing 21 is covered by the insulating member 23.

[0107] Illustratively, the insulating member 23 may be made of various materials, such as rubber, silicone, etc. Illustratively, the insulating member 23 is bonded to the outer surface of the housing 21.

[0108] The first wall 211 forms a first exposed region 2111 at a location corresponding to the first cutout region 231. That is, the first cutout region 231 is provided in the insulating member 23, and the first cutout region 231 causes the first wall 211 of the housing 21 to have an area that is exposed from the first cutout region 231, i.e., the first exposed region 2111 where the first wall 211 is not covered by the insulating member 23 is formed.

[0109] Optionally, the insulating member 23 may have one or more first cutout regions 231. For example, in FIG. 4 , the insulating member 23 is provided with two first cutout regions 231 spaced apart in a first direction Y perpendicular to the thickness direction X of the first wall. That is, two first exposed regions 2111 are formed in the first wall 211 and arranged at an interval along the first direction Y. This improves the connection strength between the first wall 211 and the pressing bar 30. Of course, in other embodiments, the number of first cutout regions 231 may be one, three, four, five, etc.

[0110] Illustratively, the first cutout area 231 is rectangular, and the corresponding first exposed area 2111 formed in the first wall 211 is also rectangular. In other embodiments, the first cutout area 231 may be triangular, pentagonal, circular, elliptical, etc.

[0111] The first exposed region 2111 is intended to be connected to the pressing bar 30, and there are various connection methods, such as adhesive bonding and welding. Illustratively, in the embodiment of the present application, the first exposed region 2111 is adhesively bonded to the pressing bar 30.

[0112] 5, the battery cell 20 further includes a pressure relief mechanism 24. The pressure relief mechanism 24 is attached to the housing 21 and relieves pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a preset value.

[0113] Optionally, the pressure relief mechanism 24 may be provided on the first wall 211 of the housing 21, on the second wall 212 of the housing 21, or on the side wall 213 of the housing 21. Exemplarily, in FIGS. 3 and 5 , the pressure relief mechanism 24 is provided on the first wall 211, and correspondingly, an escape port 232 for escaping the pressure relief mechanism 24 is provided in the insulating member 23 to facilitate the release of the internal pressure of the battery cell 20 by the pressure relief mechanism 24.

[0114] Illustratively, pressure relief mechanism 24 may be a pressure relief component such as, for example, an explosion-proof valve, an explosion-proof seat, an air valve, a pressure relief valve, or a safety valve.

[0115] By covering the outer surface of the housing 21 with an insulating member 23 to insulate the housing 21 of the battery cells 20 from the external environment, the risk of short-circuiting of the battery cells 20 during use can be reduced. Furthermore, by providing a first cutout region 231 in the insulating member 23 at a location corresponding to the first wall 211 so as to form a first exposed region 2111 in the first wall 211 of the housing 21, the battery cells 20 can be connected to the pressing bar 30 via the first exposed region 2111. When the battery cells 20 are assembled into a set to form a battery 100, the pressing bar 30 can be directly connected to the housing 21. This prevents the housing 21 from being indirectly connected to the pressing bar 30 via the insulating member 23, which contributes to reducing the influence of the insulating member 23 on the connection between the battery cells 20 and the pressing bar 30, effectively improving the connection strength and reducing the risk of the housing 21 and the pressing bar 30, which are indirectly connected via the insulating member 23, becoming detached. As a result, the battery cells 20 are insulated from the external environment and the assembly quality when assembling the battery cells 20 into a set is improved, which contributes to improving the assembly quality and usage stability of the battery 100 having such battery cells 20.

[0116] According to some embodiments of the present application, as shown in FIG. 4, the area of ​​the first exposed region 2111 is S, and S≧50 mm 2That is, the area of ​​the region formed in the first wall 211 corresponding to the first cutout region 231 and not covered with the insulating member 23 is 50 mm 2 That's all.

[0117] The area of ​​the first exposed region 2111 of the first wall 211 for connecting to the pressing bar 30 is set to 50 mm 2 By doing the above, the first wall 211 has a sufficient area for connection with the pressing bar 30, which contributes to increasing the connection area between the first wall 211 and the pressing bar 30 and increases the connection strength.

[0118] According to some embodiments of the present application, as shown in FIG. 4, the minimum distance between the first exposed area 2111 and the edge of the first wall 211 is D1, which satisfies 1 mm≦D1≦5 mm.

[0119] By setting the minimum distance between the first exposed area 2111 and the edge of the first wall 211 to 1 mm to 5 mm, the minimum distance between the first cutout area 231 provided in the insulating member 23 and the edge of the first wall 211 is set to 1 mm to 5 mm. This improves the difficulty in manufacturing the first cutout area 231, which is caused when the distance between the first cutout area 231 and the edge of the first wall 211 is too small, and reduces the difficulty in manufacturing the battery cell 20. It also improves the problem of the insulating member 23 overly covering the first wall 211, which is caused when the distance between the first cutout area 231 and the edge of the first wall 211 is too large, resulting in the area of ​​the first exposed area 2111 formed in the first wall 211 being too small.

[0120] 3 and 5 , the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall, and a side wall 213 surrounding the first wall 211 and the second wall 212. The insulating member 23 includes a first insulating member 233 and a second insulating member 234 that are provided separately, and the first insulating member 233 covers an outer surface of the first wall 211 that faces away from the electrode unit 22, and the second insulating member 234 covers an outer surface of the second wall 212 that faces away from the electrode unit 22 and an outer surface of the side wall 213 that faces away from the electrode unit 22.

[0121] The second wall 212 and the first wall 211 are provided to face each other in the thickness direction X of the first wall, and the side wall 213 surrounds the peripheries of the first wall 211 and the second wall 212. That is, the first wall 211 and the second wall 212 are provided at an interval in the thickness direction X of the first wall, and are provided at both ends of the side wall 213. The side wall 213 surrounds the periphery of the first wall 211 in the circumferential direction of the first wall 211, and surrounds the periphery of the second wall 212 in the circumferential direction of the second wall 212. The housing 21 may have a variety of structures, including a structure in which the first wall 211, the second wall 212, and the side wall 213 are each separate, a structure in which the second wall 212 and the side wall 213 are integrally molded, and the first wall 211 is connected to the end of the side wall 213 that is remote from the second wall 212, or a structure in which the first wall 211 and the side wall 213 are integrally molded, and the second wall 212 is connected to the end of the side wall 213 that is remote from the first wall 211.

[0122] The first insulating member 233 covers the outer surface of the first wall 211 that faces away from the electrode unit 22. That is, the first insulating member 233 is provided on the first wall 211 and is located on the side of the first wall 211 that faces away from the inside of the battery cell 20.

[0123] The second insulating member 234 covers the outer surface of the second wall 212 that faces away from the electrode unit 22 and the outer surface of the side wall 213 that faces away from the electrode unit 22. In other words, the second insulating member 234 is provided in the housing main body formed by the second wall 212 and the side wall 213, and is located on the side of the housing main body that faces away from the inside of the battery cell 20.

[0124] By constructing the insulating member such that the first insulating member 233 covering the first wall 211 and the second insulating member 234 covering the side wall 213 and the second wall 212 are provided separately, the first insulating member 233 and the second insulating member 234 of the insulating member 23 are provided corresponding to the first wall 211 of the housing 21, the second wall 212 and the side wall 213 of the housing 21, respectively, which contributes to reducing the difficulty of assembling the insulating member 23 and the housing 21.

[0125] 3, 4, 5, and 6, Fig. 6 is a schematic diagram of a first insulating member 233 of a battery cell 20 according to some embodiments of the present application. A first cutout area 231 is provided in the first insulating member 233.

[0126] The first cutout area 231 is a through-hole structure provided in the first insulating member 233, and penetrates the first insulating member 233 along the thickness direction X of the first wall so as to form a first exposed area 2111 in the first wall 211.

[0127] Furthermore, in an embodiment in which the minimum distance D1 between the first exposed region 2111 and the edge of the first wall 211 is 1 mm to 5 mm, the first insulating member 233 covers the surface of the first wall 211 that faces away from the electrode unit 22, and the first cutout region 231 is provided in the first insulating member 233, so the minimum distance D1 between the first exposed region 2111 and the edge of the first wall 211 becomes the minimum distance between the first cutout region 231 and the edge of the first insulating member 233. That is, the minimum distance between the first cutout region 231 and the edge of the first insulating member 233 is 1 mm to 5 mm.

[0128] By separately providing the first cutout area 231 in the first insulating member 233, the first exposed area 2111 is formed in the first wall 211. Such an insulating member 23 has a simple structure, is easy to process and manufacture, and the first cutout area 231 and the second insulating member 234 do not interfere with each other, which contributes to reducing the difficulty of assembling the battery cell 20.

[0129] In some embodiments of the present application, as shown in FIGS. 7, 8, and 9, FIG. 7 is a schematic diagram of a battery cell 20 according to other embodiments of the present application. FIG. 8 is a plan view of a battery cell 20 according to other embodiments of the present application. FIG. 9 is a schematic diagram of a battery cell 20 (after the first insulating member 233 has been removed) according to other embodiments of the present application. The second insulating member 234 has a bent portion 2341 provided in the circumferential direction of the first wall 211 and located on the side of the first wall 211 away from the electrode unit 22. The bent portion 2341 and an edge of the first insulating member 233 together form the first cutout region 231.

[0130] The second insulating member 234 has a bent portion 2341 that is provided in the circumferential direction of the first wall 211 and that is located on the side of the first wall 211 that faces away from the electrode unit 22. That is, a part of the second insulating member 234 that is provided on the outside of the housing main body formed by the second wall 212 and the side wall 213 is bent to the first wall 211 so as to form the bent portion 2341 that is located on the outer surface of the first wall 211 and has a ring-shaped structure that extends in the circumferential direction of the first wall 211.

[0131] The bent portion 2341 and the edge of the first insulating member 233 together form the first cutout region 231. That is, the first cutout region 231 is formed by being surrounded by the annular bent portion 2341 and the edge of the first insulating member 233 provided on the outer surface of the first wall 211; that is, the inner edge of the bent portion 2341 and the outer edge of the first insulating member 233 define the first cutout region 231.

[0132] 8, in an embodiment in which the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is 1 mm to 5 mm, the first cutout area 231 has a structure formed by the first insulating member 233 and the bent portion 2341, and therefore the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is the width of the bent portion 2341. In other words, the width of the bent portion 2341 is 1 mm to 5 mm.

[0133] The second insulating member 234 is provided on the first wall 211 in the circumferential direction of the first wall 211, and has a folded portion 2341 provided on an edge portion of the first wall 211. As a result, the edge portion of the first insulating member 233 formed on the first wall 211 and a part of the folded portion 2341 together form the first cutout region 231. As a result, a first exposed region 2111 is formed in the first wall 211. In a battery cell 20 having this structure, the first insulating member 233 does not have a structure with a through hole, and therefore the overall structural strength of the first insulating member 233 can be improved and the size and dimensions of the first cutout region 231 can be reduced.

[0134] According to some embodiments of the present application, as shown in FIGS. 7 and 9, a portion of the bent portion 2341 is located between the first wall 211 and the first insulating member 233 in the thickness direction X of the first wall.

[0135] A part of the bent portion 2341 is located between the first wall 211 and the first insulating member 233. In other words, a part of the first insulating member 233 is provided on the side of the bent portion 2341 that is away from the first wall 211 in the thickness direction X of the first wall, and the first insulating member 233 and the first wall 211 tightly sandwich the bent portion 2341.

[0136] 7 and 9, the first insulating member 233 has a rectangular structure, and the bent portion 2341 has a rectangular ring-shaped structure. The bent portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d, which are connected in this order in the circumferential direction of the first wall 211. The first segment 2341a and the third segment 2341c face each other in the first direction Y, and the second segment 2341b and the fourth segment 2341d face each other in the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. Both ends of the first insulating member 233 in the second direction Z respectively join the second segment 2341b and the fourth segment 2341d of the bending portion 2341, thereby positioning the bending portion 2341 between the first insulating member 233 and the first wall 211 in the thickness direction X of the first wall.

[0137] By providing a portion of the bent portion 2341 of the second insulating member 234 between the first wall 211 and the first insulating member 233 in the thickness direction X of the first wall, the first insulating member 233 can press a portion of the bent portion 2341 against the first wall 211, thereby improving the connection stability of the bent portion 2341 of the second insulating member 234 provided on the first wall 211 and reducing the risk of the bent portion 2341 falling off.

[0138] 7, 8, and 9, the first insulating member 233 and the folded portion 2341 together form two first cutout regions 231. In a first direction Y perpendicular to the thickness direction X of the first wall, the two first cutout regions 231 are located at both ends of the first insulating member 233.

[0139] In the first direction Y, the two first cutout regions 231 are located at both ends of the first insulating member 233. That is, the dimension of the first insulating member 233 in the first direction Y is smaller than the dimension of the bent portion 2341 in the first direction Y, so that both ends of the first insulating member 233 in the first direction Y form the two first cutout regions 231 together with the inner edge of the bent portion 2341. Therefore, the two first cutout regions 231 are located at both ends of the first insulating member 233 in the first direction Y.

[0140] The two ends of the first insulating member 233 in the first direction Y and the bent portion 2341 together form two cutout regions, so that two first exposed regions 2111 are formed in the first wall 211 arranged along the first direction Y, and the two first exposed regions 2111 are located at both ends of the first insulating member 233. This allows the first wall 211 to be connected to the pressing bar 30 via the two first exposed regions 2111, contributing to further improving the connection strength between the housing 21 and the pressing bar 30. In addition, this reduces the effect of interference with the first insulating member 233 when the first exposed regions 2111 and the pressing bar 30 are connected, contributing to reducing the difficulty of assembling the battery cell 20 and the pressing bar 30.

[0141] 7, 8, and 9, the folded portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d connected in this order in the circumferential direction of the first wall 211. The first segment 2341a and the third segment 2341c face each other in the first direction Y, and the second segment 2341b and the fourth segment 2341d face each other in the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. The first insulating member 233 is located between the first segment 2341a and the third segment 2341c in the first direction Y. The first segment 2341a, part of the second segment 2341b, part of the fourth segment 2341d, and one end of the first insulating member 233 in the first direction Y form one first cutout area 231. The third segment 2341c, part of the second segment 2341b, part of the fourth segment 2341d, and the other end of the first insulating member 233 in the first direction Y form another first cutout area 231.

[0142] Here, the first segment 2341a and the third segment 2341c face each other in the first direction Y, and the second segment 2341b and the fourth segment 2341d face each other in the second direction Z. That is, the bent portion 2341 of the second insulating member 234 has a rectangular ring-shaped structure.

[0143] The first insulating member 233 is located between the first segment 2341a and the third segment 2341c in the first direction Y. The first segment 2341a, part of the second segment 2341b, part of the fourth segment 2341d, and one end of the first insulating member 233 in the first direction Y form one first cutout region 231. The third segment 2341c, part of the second segment 2341b, part of the fourth segment 2341d, and the other end of the first insulating member 233 in the first direction Y form another first cutout region 231. In other words, the first insulating member 233 is located between the first segment 2341a and the third segment 2341c in the first direction Y, and is provided with a gap between it and the first segment 2341a and the third segment 2341c. Both ends of the first insulating member 233 in the second direction Z join the second segment 2341b and the fourth segment 2341d, respectively, and cover part of the second segment 2341b and part of the fourth segment 2341d. Therefore, one first cutout region 231 is formed between one end of the first insulating member 233 in the first direction Y and the first segment 2341a, and another first cutout region 231 is formed between the other end and the third segment 2341c.

[0144] The bending portion 2341 has a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d connected in this order in the circumferential direction of the first wall 211. The first segment 2341a and the third segment 2341c are opposed to each other in the first direction Y, and the second segment 2341b and the fourth segment 2341d are opposed to each other in the second direction Z, thereby forming the bending portion 2341 having a rectangular ring-shaped structure. Furthermore, by providing the first insulating member 233 between the first segment 2341a and the third segment 2341c in the first direction Y, both end edge portions of the first insulating member 233 in the first direction Y can form the bending portion 2341 and two first cutout regions 231, respectively, resulting in a simple structure and easy implementation.

[0145] 3, 5, and 7, the second wall 212 and the side wall 213 have an integrally molded structure, and in the thickness direction X of the first wall, one end of the side wall 213 is connected to the second wall 212, and the other end is formed as an opening 2131. The first wall 211 is an end cover that closes the opening 2131.

[0146] The second wall 212 and the side wall 213 form a hollow structure having an opening 2131 at one end of the first wall in the thickness direction X. The first wall 211 closes the opening 2131, thereby forming a housing 21 for accommodating the electrode unit 22. Of course, in other embodiments, the second wall 212 and the side wall 213 may be separate structures. That is, the side wall 213 may have a hollow structure having openings 2131 at both ends of the first wall in the thickness direction X, and the first wall 211 and the second wall 212 may each close two openings 2131 of the side wall 213.

[0147] The second wall 212 and the side wall 213 have an integrally molded structure. That is, the second wall 212 and the side wall 213 of the housing 21 are formed by an integral molding method such as pressing or casting.

[0148] When the second wall 212 and the side wall 213 of the housing 21 are formed as an integrally molded structure, an opening 2131 is formed at the end of the side wall 213 away from the second wall 212, and the first wall 211 closes the opening 2131, the housing 21 can be assembled from two parts. With the housing 21 having this structure, it is easy to cover the second insulating member 234 of the insulating member 23 with the outer surfaces of the integrally molded second wall 212 and side wall 213, which contributes to reducing the difficulty of assembling the battery cell 20.

[0149] 3, 6, 7, and 10, Fig. 10 is a schematic diagram of a first insulating member 233 of a battery cell 20 according to other embodiments of the present application. The battery cell 20 further includes an electrode terminal 25 provided on the first wall 211 and electrically connected to the electrode unit 22. The insulating member 23 has a mounting hole 235 through which the electrode terminal 25 is drilled, and the mounting hole 235 is spaced apart from the first cutout region 231.

[0150] The mounting hole 235 is provided at a distance from the first cutout region 231. That is, the electrode terminal 25 provided in the first wall 211 is provided at a distance from the first cutout region 231, and a part of the insulating member 23 is located between the electrode terminal 25 and the first cutout region 231.

[0151] The electrode terminal 25 is provided on the first wall 211, and a mounting hole 235 through which the electrode terminal 25 passes is provided in a position of the insulating member 23 corresponding to the electrode terminal 25. By providing the mounting hole 235 at a distance from the first cutout region 231, the first exposed region 2111 formed in the first wall 211 corresponding to the first cutout region 231 can be provided at a distance from the electrode terminal 25, thereby reducing the influence of interference with the electrode terminal 25 when the first exposed region 2111 is connected to an external component. Furthermore, because the insulating member 23 does not provide communication between the first cutout region 231 and the mounting hole 235, the insulating member 23 is inserted around the electrode terminal 25, thereby improving the connection reliability of the insulating member 23.

[0152] In some embodiments of the present application, as shown in FIGS. 3, 6, 7 and 10, the minimum distance between the first cutout area 231 and the mounting hole 235 is D2, which satisfies D2≧0.5 mm.

[0153] The minimum distance between the first cutout area 231 and the mounting hole 235 is D2. In other words, in the arrangement direction of the first cutout area 231 and the mounting hole 235, the minimum dimension of the portion of the first insulating member 233 of the insulating member 23 between the first cutout area 231 and the mounting hole 235 is D2.

[0154] By making the minimum distance between the first cutout area 231 and the mounting hole 235 0.5 mm or more, the minimum dimension of the portion of the insulating member 23 between the first cutout area 231 and the mounting hole 235 is 0.5 mm or more, thereby reducing the risk of breakage due to the dimension of the portion of the insulating member 23 between the first cutout area 231 and the mounting hole 235 being too small.

[0155] 3, 6, 7, and 10, the insulating member 23 is provided with two first cutout areas 231 arranged along the first direction Y to form two first exposed areas 2111 arranged along the first direction Y perpendicular to the thickness direction X of the first wall 211. The first wall 211 is provided with two electrode terminals 25 arranged along the first direction Y and positioned between the two first cutout areas 231. In the first direction Y, the minimum distance between each first cutout area 231 and the adjacent mounting hole 235 is D2.

[0156] 6, in an embodiment in which the first cutout region 231 is provided in the first insulating member 233, D2 is the distance in the first direction Y between the first cutout region 231 and the adjacent mounting hole 235. In an embodiment in which the first insulating member 233 and the folded portion 2341 of the second insulating member 234 surround each other, D2 is the distance in the first direction Y between the first cutout region 231 and one end of the adjacent first insulating member 233, as shown in FIG.

[0157] The insulating member 23 is provided with two first cutout areas 231 arranged along the first direction Y, the first wall 211 is provided with two electrode terminals 25 arranged along the first direction Y and located between the two first cutout areas 231, and the minimum distance between the first cutout area 231 and the adjacent mounting hole 235 is D2. Setting the minimum dimension of D2 can reduce the risk of the portions of the insulating member 23 corresponding to the first exposed areas 2111 and the electrode terminals 25 in the first direction Y being broken during use.

[0158] 3 and 7 , in some embodiments of the present application, two first cutout regions 231 arranged along the first direction Y are provided in the insulating member 23 to form two first exposed regions 2111 arranged along the first direction Y perpendicular to the thickness direction X of the first wall in the first wall 211. In the first direction Y, the electrode terminal 25 is located between the two first exposed regions 2111. In other words, the two first cutout regions 231 are located on both sides of the two electrode terminals 25 in the first direction Y, such that one first cutout region 231, one electrode terminal 25, another electrode terminal 25, and another first cutout region 231 are arranged in order along the first direction Y.

[0159] In order to form two first exposed areas 2111 arranged along the first direction Y in the first wall 211, two first cutout areas 231 arranged along the first direction Y are provided in the insulating member 23. In addition, the electrode terminal 25 is provided between the two first exposed areas 2111. This makes it possible to further improve the connection strength between the first wall 211 and the pressing bar 30 by providing the two first exposed areas 2111 on both sides of the electrode terminal 25. In addition, by providing the two first exposed areas 2111 on both sides of the electrode terminal 25, it is possible to reduce the difficulty of connecting the battery cells 20 to the pressing bar 30 when assembling the battery cells 20 into a set.

[0160] In some embodiments, the battery cell 20 may have other structures. For example, the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The battery cell 20 further includes two electrode terminals 25 provided on the first wall 211 and the second wall 212, respectively, and electrically connected to the electrode units 22. In other words, the two electrode units 22, one for a positive electrode and one for a negative electrode, for input and output of the battery cell 20 are provided on both sides of the housing 21 in the thickness direction X of the first wall. Of course, in other embodiments, the electrode terminals 25 may be provided on the side walls 213.

[0161] By providing the two electrode terminals 25 of the battery cell 20 on the opposing first wall 211 and second wall 212 of the housing 21, respectively, more space can be secured to form the first exposed area 2111 on the first wall 211, and the difficulty of providing the first cutout area 231 on the insulating member 23 can be reduced.

[0162] 3, 5, and 11, Fig. 11 is a bottom view of a battery cell 20 according to some embodiments of the present application. The housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The insulating member 23 is further provided with a second cutout region 236 located on a side of the second wall 212 facing away from the electrode unit 22 in the thickness direction X of the first wall. The second wall 212 has a second exposed region 2121 for connection to the housing 10 at a position corresponding to the second cutout region 236.

[0163] The second wall 212 has a second exposed region 2121 formed at a position corresponding to the second cutout region 236. That is, the second cutout region 236 is provided in the insulating member 23, and the second wall 212 of the housing 21 has a region that is exposed from the second cutout region 236. This results in the second wall 212 having the second exposed region 2121 that is not covered by the insulating member 23.

[0164] Optionally, the insulating member 23 may have one or more second cutout areas 236. For example, in Fig. 11, one second cutout area 236 is provided in the insulating member 23, thereby forming one second exposed area 2121 in the second wall 212. Of course, in other embodiments, two, three, four, five, etc. second cutout areas 236 may be formed.

[0165] Illustratively, the second cutout area 236 is rectangular, and the second exposed area 2121 formed in the second wall 212 is also rectangular correspondingly. In other embodiments, the second cutout area 236 may be triangular, pentagonal, circular, elliptical, etc.

[0166] The second exposed region 2121 is intended to be connected to the housing 10, and the connection method can be various, for example, by adhesion, welding, etc. Illustratively, in the embodiment of the present application, the second exposed region 2121 is adhered to the housing 10.

[0167] In an embodiment in which the insulating member 23 includes a first insulating member 233 and a second insulating member 234 that are provided separately, the second cutout region 236 is provided in the second insulating member 234. The second cutout region 236 is a through hole provided in the second insulating member 234, and is located on the side of the second wall 212 that faces away from the electrode unit 22.

[0168] A first cutout region 231 and a second cutout region 236 are provided at positions on both sides of the insulating member 23 corresponding to the first wall 211 and the second wall 212, respectively. That is, the insulating member 23 is provided with the first cutout region 231 and the second cutout region 236 on opposite sides of the housing 21 in the thickness direction X of the first wall. This forms a first exposed region 2111 and a second exposed region 2121 in the first wall 211 and the second wall 212 of the housing 21, respectively, and allows the first wall 211 and the second wall 212 of the housing 21 to be connected to the pressing bar 30 and the housing 10, respectively, via the first exposed region 2111 and the second exposed region 2121. This improves the structural stability of the battery cells 20 assembled within the housing 10. Furthermore, because the housing 21 is directly connected to the housing 10, the risk of the housing 21 and the housing 10, which are indirectly connected via the insulating member 23, becoming detached can be reduced.

[0169] In some embodiments of the present application, the present application further provides a battery 100, which includes any of the battery cells 20 described above.

[0170] In some embodiments of the present application, as shown in Figures 2 and 3, the battery 100 further includes a housing 10 and a pressure bar 30, which is housed in the housing 10 together with the battery cells 20 and is adhered to the first exposed area 2111.

[0171] 2, the battery cell 20 is placed in the housing 10. That is, the second wall 212 of the battery cell 20 is arranged so as to support the electrode unit 22 in the thickness direction X of the first wall. That is, the first wall 211 of the housing 21 is provided facing the top of the housing 10, and the second wall 212 of the housing 21 is provided facing the bottom of the housing 10. Alternatively, in actual use, the second wall 212 of the housing 21 is provided facing toward the ground or downward so that the thickness direction X of the first wall is the up-down direction.

[0172] The pressing bar 30 is provided between the first wall 211 and the top of the housing 10 in the thickness direction X of the first wall, and is bonded to a first exposed area 2111 formed on the first wall 211.

[0173] Optionally, the pressure bar 30 is made of an insulating material, such as rubber, synthetic resin, silicone, etc. The pressure bar 30 of this structure achieves an insulating connection between the pressure bar 30 and the battery cells 20, reducing the risk of leakage or short circuit.

[0174] In another embodiment, the battery cell 20 is placed upside down in the housing 10. That is, the first wall 211 of the battery cell 20 is arranged so as to support the electrode unit 22 in the thickness direction X of the first wall. As a result, the pressing bar 30 is provided between the first wall 211 and the bottom of the housing 10 in the thickness direction X of the first wall, and is bonded to a first exposed area 2111 formed on the first wall 211.

[0175] The battery 100 is provided with a casing 10 and a pressing bar 30, and the pressing bar 30 is attached to the first exposed region 2111 of the housing 21 of the battery cell 20, thereby fixing the battery cell 20 within the casing 10 of the battery 100. In a battery 100 with this structure, the housing 21 of the battery cell 20 can be directly attached to the pressing bar 30 without the insulating member 23, which helps reduce the influence of the insulating member 23 on the adhesion between the battery cell 20 and the pressing bar 30, reduces the risk of the housing 21 and pressing bar 30, which are indirectly attached via the insulating member 23, becoming detached, and effectively increases the adhesive strength. As a result, the structural stability of the battery cell 20 assembled within the casing 10 is improved, the risk of the battery cell 20 shaking or coming off during use is reduced, and the assembly quality and usability stability of the battery 100 can be improved.

[0176] In some embodiments, as shown in FIGS. 2 and 3, the battery 100 includes a plurality of battery cells 20, and the pressure bar 30 is attached to the first exposed areas 2111 of the plurality of battery cells 20.

[0177] The pressing bars 30 are adhered to the first exposed areas 2111 of the plurality of battery cells 20. That is, one pressing bar 30 is adhered to the first exposed areas 2111 of the housings 21 of the plurality of battery cells 20.

[0178] A plurality of battery cells 20 are provided in the housing 10, and the pressing bar 30 and the first exposed areas 2111 of the plurality of battery cells 20 are adhered to each other, so that the pressing bar 30 can connect the plurality of battery cells 20 together, which contributes to improving the structural strength and structural stability of the plurality of battery cells 20 in the housing 10, and effectively increases the stability of use of the battery 100.

[0179] 2, 3, and 11, the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The insulating member 23 is further provided with a second cutout region 236 located on the side of the second wall 212 facing away from the electrode unit 22 in the thickness direction X of the first wall, and the second wall 212 is formed with a second exposed region 2121 that is bonded to the housing 10 at a position corresponding to the second cutout region 236.

[0180] Illustratively, the battery cell 20 is placed upright in the housing 10 so that the second exposed area 2121 formed on the second wall 212 is adhered to the bottom of the housing 10. When the battery cell 20 is placed upside down in the housing 10, the second exposed area 2121 formed on the second wall 212 is adhered to the top of the housing 10.

[0181] By adhering the second exposed region 2121 of the housing 21 of the battery cell 20 to the casing 10, the battery cell 20 is more securely fixed within the casing 10. In the battery 100 with this structure, the housing 21 of the battery cell 20 is directly adhered to the casing 10 without the insulating member 23, which helps reduce the influence of the insulating member 23 on the adhesion between the battery cell 20 and the casing 10 and effectively increases the adhesive strength. This improves the structural stability of the battery cell 20 assembled within the casing 10, reduces the risk of the battery cell 20 shaking or coming loose during use, and improves the assembly quality and usability of the battery 100.

[0182] According to some embodiments of the present application, the present application further provides an electrical device, the electrical device including any of the batteries 100 described above for providing power.

[0183] The electrical device may be any of the devices and systems that use the battery 100 described above.

[0184] According to some embodiments of the present application, as shown in FIGS. 3 to 7 , the present application provides a battery cell 20. The battery cell 20 includes a housing 21, an electrode unit 22, an insulating member 23, and two electrode terminals 25. The housing 21 includes a first wall 211, a second wall 212, and a side wall 213. The first wall 211 faces the second wall 212 in the thickness direction X of the first wall, and the side wall 213 surrounds the periphery of the second wall 212 and is integrally formed with the second wall 212. An opening 2131 is formed at an end of the side wall 213 away from the second wall 212, and the first wall 211 serves as an end cover that closes the opening 2131. The electrode unit 22 is accommodated in the housing 21. The insulating member 23 includes a first insulating member 233 and a second insulating member 234 that are provided separately. The first insulating member 233 covers the outer surface of the first wall 211 that faces away from the electrode unit 22, and the second insulating member 234 covers the outer surface of the second wall 212 that faces away from the electrode unit 22 and the outer surface of the side wall 213 that faces away from the electrode unit 22. The first insulating member 233 is provided with two first cutout regions 231 that are arranged at an interval along the first direction Y, and first exposed regions 2111 for bonding to the two pressing bars 30 are formed at positions corresponding to the two first cutout regions 231 of the first wall 211. The second insulating member 234 is provided with a second cutout region 236, and second exposed regions 2121 for bonding to the housing 10 are formed at positions corresponding to the second cutout region 236 of the second wall 212. The area of ​​the first exposed region 2111 is S1, and S1 ≧ 50 mm 2 The two electrode terminals 25 are provided on the first wall 211 and are electrically connected to the electrode unit 22. In the first direction Y, the two electrode terminals 25 are located between the two first exposed areas 2111. The first insulating member 233 is provided with mounting holes 235 through which the electrode terminals 25 pass, and the minimum distance between each first cutout area 231 and the adjacent mounting hole 235 is D1, which satisfies D1≧0.5 mm.

[0185] Furthermore, unless there is a contradiction, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0186] The above description is merely a preferred embodiment of the present application and does not limit the present application. Those skilled in the art may have various modifications and variations to the present application. As long as they do not deviate from the spirit and principle of the present application, any modifications, equivalent replacements, improvements, etc., fall within the protection scope of the present application. [Explanation of symbols]

[0187] 1000 vehicles 100 batteries 10. Cabinet 11 First housing body 12 Second housing body 20 battery cells 21 Housing 211 The First Wall 2111 1st exposure area 212 The Second Wall 2121 2nd exposure area 213 Side wall 2131 Aperture 22 Electrode unit 23 Insulating material 231 First cutout area 232 Evasion Exit 233 First insulating member 234 Second insulating member 2341 Bending part 2341a 1st segment 2341b 2nd segment 2341c Third Segment 2341d 4th segment 235 Mounting hole 236 Second Cutout Area 24 Pressure relief mechanism 25 Electrode terminal 30 Pressing bar 200 Controller 300 motor X thickness direction of the first wall Y 1st direction Z 2nd direction

Claims

1. a housing including a first wall; an electrode unit accommodated in the housing; an insulating member that covers the outside of the housing and covers an outer surface of the first wall that is separated from the electrode unit in a thickness direction of the first wall; Including, The insulating member is provided with a first cutout region located on a side of the first wall that is away from the electrode unit in the thickness direction of the first wall, and the first wall is formed with a first exposed region for connection to a pressing bar at a position corresponding to the first cutout region. Battery cell.

2. The area of ​​the first exposed region is S, and S≧50 mm ２ fulfill The battery cell according to claim 1 .

3. The minimum distance between the first exposed area and the edge of the first wall is D １ and 1 mm≦D １ Meets ≦5mm The battery cell according to claim 1 or 2.

4. the housing further includes a second wall facing the first wall in a thickness direction of the first wall, and a side wall surrounding the first wall and the second wall, The insulating member includes a first insulating member and a second insulating member that are provided separately, the first insulating member covering an outer surface of the first wall that faces away from the electrode unit, and the second insulating member covering an outer surface of the second wall that faces away from the electrode unit and an outer surface of the side wall that faces away from the electrode unit. The battery cell according to any one of claims 1 to 3.

5. The first cutout area is provided in the first insulating member. The battery cell according to claim 4 .

6. The second insulating member has a bent portion provided in the circumferential direction of the first wall and located on a side of the first wall away from the electrode unit, and the bent portion and an edge of the first insulating member together form the first cutout region. The battery cell according to claim 4 .

7. A part of the bent portion is located between the first wall and the first insulating member in the thickness direction of the first wall. The battery cell according to claim 6 .

8. The first insulating member and the folded portion together form the two first cutout regions, and the two first cutout regions are located at both ends of the first insulating member in a first direction perpendicular to the thickness direction of the first wall. The battery cell according to claim 6 or 7.

9. the bent portion includes a first segment, a second segment, a third segment, and a fourth segment that are connected in sequence in a circumferential direction of the first wall, the first segment and the third segment face each other in the first direction, the second segment and the fourth segment face each other in the second direction, the first direction, the second direction, and a thickness direction of the first wall are perpendicular to each other, The first insulating member is located between the first segment and the third segment in the first direction, and one of the first cutout areas is formed by the first segment, a portion of the second segment, a portion of the fourth segment, and one end of the first insulating member in the first direction, and another of the first cutout areas is formed by the third segment, a portion of the second segment, a portion of the fourth segment, and the other end of the first insulating member in the first direction. The battery cell of claim 8 .

10. The second wall and the side wall are integrally molded, and in the thickness direction of the first wall, one end of the side wall is connected to the second wall and the other end is formed as an opening, and the first wall is an end cover that closes the opening. The battery cell according to any one of claims 4 to 9.

11. the battery cell further includes an electrode terminal provided on the first wall and electrically connected to the electrode unit; The insulating member is provided with a mounting hole into which the electrode terminal is drilled, and the mounting hole is provided at a distance from the first cutout area. The battery cell according to any one of claims 1 to 10.

12. The minimum distance between the first cutout area and the mounting hole is D ２ and D ２ Satisfies ≧0.5 mm The battery cell of claim 11 .

13. two first cutout regions arranged along a first direction are provided in the insulating member so as to form two first exposed regions arranged along the first direction perpendicular to a thickness direction of the first wall; The first wall is provided with two electrode terminals arranged along the first direction and positioned between two of the first cutout areas, and the minimum distance between each of the first cutout areas and the adjacent mounting hole in the first direction is D ２ is The battery cell of claim 12.

14. two first cutout regions arranged along a first direction are provided in the insulating member so as to form two first exposed regions arranged along the first direction perpendicular to a thickness direction of the first wall; In the first direction, the electrode terminal is located between two of the first exposed areas. The battery cell according to claim 11 or 12.

15. the housing further includes a second wall facing the first wall in a thickness direction of the first wall, The battery cell further includes two electrode terminals respectively provided on the first wall and the second wall and electrically connected to the electrode unit. The battery cell according to any one of claims 1 to 10.

16. the housing further includes a second wall facing the first wall in a thickness direction of the first wall, The insulating member is further provided with a second cutout region located on a side of the second wall that is away from the electrode unit in the thickness direction of the first wall, and the second wall is formed with a second exposed region for connection to a housing at a position corresponding to the second cutout region. The battery cell according to any one of claims 1 to 15.

17. A battery comprising the battery cell according to any one of claims 1 to 16.

18. The battery further includes a housing and a pressure bar, the pressure bar being housed in the housing together with the battery cell and being bonded to the first exposed area.

18. The battery of claim 17.

19. The battery includes a plurality of the battery cells, and the pressure bar is adhered to the first exposed areas of the plurality of the battery cells.

20. The battery of claim 18.

20. the housing further includes a second wall facing the first wall in a thickness direction of the first wall, The insulating member is further provided with a second cutout region located on a side of the second wall that is away from the electrode unit in the thickness direction of the first wall, and the second wall is formed with a second exposed region that is bonded to a housing at a position corresponding to the second cutout region.

20. The battery of claim 18 or 19.

21. An electrical device comprising the battery of any one of claims 17 to 20.

Images